Bonding Interface Evaluation Using Ultrasonic Transverse Waves
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Solution Overview
Problem
Conventional ultrasonic methods, such as vertical flaw detection using longitudinal waves, often misidentify kissing bonds and coronabonds as joined parts due to lack of reflection echoes, and methods using burst ultrasound have limited precision in evaluating unjoined parts.
Innovation Solution
A bonding interface evaluation method and device that utilizes ultrasonic transverse waves, which are transmitted perpendicularly to the bonding interface, allowing for precise evaluation of joined states by analyzing reflection and transmission signals, potentially combined with longitudinal waves for more detailed assessments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If longitudinal ultrasound is used for vertical flaw detection, then the measurement can be performed with simple equipment, but kissing bonds and coronabonds are misidentified as joined parts
Solution Approach 1:
The patent changes the wave type parameter from longitudinal to transverse ultrasound. Transverse waves are used instead of longitudinal waves to generate shear stresses at the bonding interface, which produce detectable reflection echoes from unjoined parts like kissing bonds and coronabonds, thereby improving measurement precision while maintaining operational simplicity
Solution Approach 2:
The patent substitutes the mechanical interaction mode from compressional (longitudinal) to shear (transverse). By using transverse waves, the measurement system can detect the absence of bonding through shear stress reflection, replacing the insufficient compressional wave detection mechanism
2Reliability
If burst ultrasound is used to detect unjoined parts, then some improvement in detection capability is achieved, but precision in evaluating kissing bonds and coronabonds remains limited
Solution Approach 1:
The patent changes the fundamental wave type parameter from burst longitudinal ultrasound to transverse ultrasound. This parameter change enables precise evaluation of kissing bonds and coronabonds by generating shear stresses that produce clear reflection echoes, significantly improving measurement precision while maintaining reliable detection
3Measurement precision
If transverse wave is used to detect discontinuous parts, then detection precision is improved, but the measurement setup becomes complex requiring special elements or contact media
Solution Approach 1:
The patent introduces water as an intermediary medium to enable transverse wave transmission. By using water immersion, the system can generate and transmit transverse waves without requiring special transverse piezoelectric elements or complex contact media, thereby reducing device complexity while maintaining high detection precision
Solution Approach 2:
The patent replaces complex mechanical transverse wave generation systems with a water-based transduction method. Instead of using special transverse piezoelectric elements or wedges, the system uses longitudinal waves transmitted through water to generate transverse waves in the test piece, simplifying the measurement setup
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise evaluation of joined states, including unjoined parts like kissing bonds and coronabonds, by distinguishing between reflection and transmission signals of transverse and longitudinal waves, improving detection accuracy and detailing the bonding interface's status.
Implementation Method 1
transmitting an ultrasonic transverse wave in a substantially perpendicular direction to the bonding interface
Implementation Method 2
a transverse wave is a shear wave and excellent in detecting a discontinuous part
Implementation Method 3
receiving a reflection signal of the transverse wave transmitted in the transmission step and reflected by the bonding interface
Data Source
AI summary
An ultrasonic transverse wave is transmitted or ultrasonic longitudinal wave and transverse wave are transmitted in a perpendicular direction to a bonding interface between materials by transmission such as a probe. A reflection signal of the transmitted transverse wave reflected by the bonding interface and/or a transmission signal of the transmitted transverse wave transmitted through the bonding interface and the longitudinal wave, a reflection signal of the transmitted longitudinal wave reflected by the bonding interface and/or a transmission signal of the transmitted longitudinal wave transmitted through the bonding interface are received by reception such as the probe. A physical quantity of the reflection signal or the transmission signal of the transverse wave, out of the received signals, and the longitudinal wave, a joined state of the bonding interface is evaluated by analysis evaluation, utilizing a predetermined physical quantity of the reflection signal or the transmission signal of the longitudinal wave.